<!-- templates/404.html -->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>页面未找到 - 404</title>
    <link href="https://npmmirror.com/mirrors/bootstrap/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body class="bg-light d-flex align-items-center justify-content-center" style="height: 100vh;">
    <div class="text-center">
        <h1 class="display-4 text-danger">404</h1>
        <p class="lead">抱歉，您访问的页面不存在。</p>
        <a href="/question/" class="btn btn-primary mt-3">返回首页</a>
    </div>
</body>
</html>
